Channelling appliance for shoesewing machines



Feb. 27, 1951 w, Rus ows 2,543,204

CHANNELLING APPLIANCE FOR SHOE-SEWING MACHINES Filed May 27, 1949 INVENTOR.

Augusz. M @Jskou/sh GWJM 1m 64 211 Patented Feb. 27, 1951 OFFICE CHANNELLING APPLIANCE FOR SHOE- SEWING MACHINES August W. Ruskowsky, Jackson. Mich, assignor of fifty-one per cent to J. Frank Harper, Jackson,

Mich.

Application May 27, 1949, Serial No. 95,863

Claims. 1.

This invention relates to an appliance that can be secured to a curved needle shoe sewing machine for the purpose of providing a series of punched recesses to take the place of the channel which is ordinarily plowed in the leather sole for the purpose of receiving the stitches so that the top surfaces of the stitches will be substantially flush with the surface of the sole. Ordinarily a pointed or a plow-like channeling member is provided which plows a channel in the leather surface when the work is f ed forward after the awl has punched a hole in the work. This mechanism has defects that have been long recognized.

It is the object of the present invention to provide an appliance that can be fastened to the needle clamp and tripped each time the needle and the needle clamp come down upon the work to force a punch into the leather of the sole for the purpose of providing a dent or recess in which to locate a subsequent stitch.

Referring to the drawings: i

Fig. l is a vertical section through the shaft, the needle arm supporting hub, the awl supporting sleeve, and the work support, showing the needle and the awl in retracted position.

Fig. 2 is a similar section showing the awl after it has pierced the work and is in position to help feed the work forward.

Fig. 3 is a similar view showing the awl withdrawn and the needle clamp and needle shifted to bring the needle through the work.

Fig. 4 is a front elevational view oi'the sam parts.

Fig. 5 is a top plan view of the appliance which is bolted to the presser foot supporting armto take the place of the usual presser foot.

Fig. 6 is a detail showing a fragment --of the sole with the punched recesses and some stitches located in the recesses.

Fig. 7 is a perspective of the tripping cam which is bolted to the needle head to take the plac of part of the usual needle clamp.

Fig. 8 is a perspective of the punch.

These shoe sewing machines are complicated pieces of mechanism and I propose to describe and show my invention in as simple form as possible by omitting a showing of the mechanism by which the awl, the needle, and the feeder mechanism operate and the mechanism by which the thread is drawn through the opening punched by the awl and a lock stitch formed by suitable mechanism. These are all well known by those skilled in the art and do not need to be shown or explained in order to provide a proper disclosure of my invention.

3 ed stud is that is held in place by nut ll.

" toggle at its knee.

.l is the work Supporting arm on which the work W is supported. P is the presser foot supporting arm to which normally a presser foot (not shown) is bolted. N is the needle supporting arm secured to hub 2 which oscillates on the awl hub 3. This awl hub is provided with an integral arm Q Which supports the curved awl 5 which is secured on the arm by the clamping block 6 and the bolt 1. The curved needle 8 is clamped to the needle supporting arm N by the clamping block 9 (see Fig. '7) which has a threadis a needle guide that swings down with the needle until the neck is strikes the work (see Fig. 3).

Many of these curved needle sewing machines work on this principle: The work supporting arm I and the presser foot lever P can move toward and away from each other slightly to bring the presser foot l5 and the work support it against the work to grip the work or be re- I leased from the work. They can move backward the length of the stitch to feed the work again forward after they have again gripped the work. This gripping action and this moving back and forth is not here shown, but mechanism for this purpose is shown and described in the Leveque Patent 2,162,046 and the Ashworth Patent 1,169,- 909. In the Leveque patent the presser lever and the supporting lever are carried on a slide which is reciprocated back and forth by operating on a This action serves to feed the work forward after each stitch. Inasmuch as this is a-complicated piece of mechanism and the means of gripping and releasing the work andv feeding it forward intermittently is no part of my'invention, this is not shown but reference is made to these aforementioned patents.

The awl 5 carried onthe arm i is supported on the awl hub 3' which bolted by set screws 34 to sleeve 3 that turns on the shaft i l but which is slid back and forth with the reciprocation of the shait id as shown in 2'? and 33 of the Ashworth patent and described in lines 116 of this patent, page 3 and following.

In place of the usual presser foot that is bolted to the presser foot lever P, I bolt thereto my.

appliance which comprises the L, shaped presser foot B5. The presser foot is bolted to the presser foot lever P by means of bolts H (see Figs. 4 and 5) This appliance comprises a toothed foot undersurface S for gripping the work and an upstanding arm portion i9 which is bolted directly to the supporting lever P. This upright portion of the appliance pivots at 2t (see Fig. 1) a bell crank lever 25 which is normally pressed outwardly by the coil compression spring 22. This bell crank lever has an actuating nub 23 (Figs. 1 and 4) that engages in the slot 24 in the punch 25 which is guided in the punch guide 35. This punch guide is an integral part of the upright 19 part of the appliance. When the needle supporting arm N is moved on to the position shown in Fig. 3, it pushes the bell crank arm from the position shown in Fig. 1 to the position shown in Fig. 3. The roll or cam 26 on the needle clamp (see Figs. 7 and 3) strikes the bell crank arm and pushes it to the vertical position shown in Fig. 3 thereby causing the nub 23 of bell crank lever 2i to push the punch downward from the position it is shown in Fig. 1. This will push the sharp punch edge into the work forming the recess 28 in the work shown in Fig. 6. So each time the curved needle is operated by the actuating mechanism, the needle arm, through the clamping block 9 and the cam or roll 26, strikes the bell crank lever and thrusts the punch into the work to produce a recess 28. Two of these recesses are provided in advance of the stitch.

This is quite a different way of making a seat for the stitches. Ordinarily a channel is plowed in the work when the work moves forward against the ordinary knife or channeller or when the knife moves through the leather of the sole on the return movement of the awl (see lines 120, page 12 of the Ashworth patent).

The mode of operation of my appliance is as follows: In conformity with the machines described and shown in the two previously mentioned patents, the actuating parts of the machine to which my appliance is attached serve to clamp the presser foot I upon the work W upon the work support l6. When the awl has returned from its feeding operation by the reciprocating axial movement of the shaft M and the hub 3 as described and shown in the Ashworth patent, the awl hub is oscillated to cause the awl 5 to punch a hole in the work as shown in Fig. 2. Thereupon the awl is withdrawn from the work as shown in Fig. 3 and the curved needle l 3 comes down and passes through the opening that has been punched by the awl. The hook on the needle catches the thread and pulls it back through the opening as shown and described in detail in the Ashworth patent, and the lock stitch is formed in a way that is well known by those skilled in the art. and which is described and shown in the Ashworth patent. Thereupon the stitch 3!) is pulled tight as shown in Fig. 6 and the stitch itself sinks down into one of the recesses or dents made in the welt. Thereupon the presser foot and the work support are released from the work and the member that supports the presser foot arm P and the work supporting lever I move back on the work to carry the presser foot back a distance of one stitch to pick up the work for another feeding forward. A slide for this purpose is shown in Fig. 3 of the Leveque Patent 2,162,046. At the same time the awl supporting arm is pushed backward to bring the awl back to where the presser foot and work support engage the work. A mechanism for this purpose is referred to in the Leveque patent, lines 16 to 21, column 1, page 2, where reference is made back to the Ashworth Patent 1,169,909, where, in Figs. 27 and 28, a

mechanism for so feeding the awl backward is shown and described in lines and following, page 3. Thereupon the awl is actuated to push it up through the work as already described and shown in Fig. 2. Thereupon the presser foot, work support, and the awl, all move forward carrying the work with them, and the hole that has been punched by the awl is exposed directly under and in registry with the needle as the awl withdraws as shown in Fig. 3. Thereupon the needle comes down and passes through (see Fig. 3) the opening made by the awl to pick up the thread. At the same time, as already explained, the cam or roll on the needle clamp strikes the bell crank lever which pushes the punch down as already described, and thereby affords a punched in recess or dent in the work. This dent or recess will be not for the next stitch, but for the second next stitch (see Fig. 6)

This specific appliance, as actually shown, is designed to be bolted directly to the presser foot supporting lever of the well known Landis shoe sewing machine when the customary presser foot has been removed. Obviously it can be modified slightly to be applied to any other shoe sewing machine of the curved needle type.

What I claim is:

1. An appliance adapted to be secured to the presser foot lever of a shoe sewing machine, having a curved needle and needle clamp, a pressure foot supporting lever, a work support lever, and a curved awl and clamp with mechanism f0: operating these several elements, said appliance comprising a punch guide adapted to be secured to one of said levers, a punch slidable in said guide, an actuating member connected with said punch and supported upon said punch guide, and means adapted to be secured to said clamp for engaging the actuator each time the clamp is moved toward the work to actuate the punch to recess the sole to provide a seat for the stitches.

2. In a device as claimed in claim 1 in which the actuating member is a pivoted spring retracted lever having a part to engage with the punch to force it toward the work with the clamp when the means on the clamp engages the lever.

3. In a device as claimed in claim 1 in which the punch guide is part of a presser foot adapted to be secured to the presser foot supporting lever, and the means on the clamp that actuates the punch actuating member is on the needle clamp.

4. In a device as claimed in claim 1 in which the actuating member connected with the punch is a bell crank lever having a nub engaging in a slot in the punch.

5. In a device as claimed in claim 1 in which the means on the clamp comprises a roll or cam which is part of the clamping block.

AUGUST W. RUSKOWSKY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,924,737 Ferrara Aug. 23, 1933 2,197,796 Ferrara Apr. 23, 1940 

